commit | f13e3a8e7b0ee5561d11fd12eba50acf9ecd22b9 | [log] [tgz] |
---|---|---|
author | Hector Dearman <hjd@google.com> | Wed Jul 25 13:19:35 2018 +0100 |
committer | Hector Dearman <hjd@google.com> | Wed Jul 25 13:19:35 2018 +0100 |
tree | 5e9db1275314f1560d803efc707a1532e07b5701 | |
parent | b1589ae6be41855308a22948da3967a381ef703a [diff] |
Create strongly typed frontend/controller objects Creates two new classes: - Controller This object exposes the functionality of the controller worker to the main thread. This should have not that many methods - most of the time the UI will use doAction to send a pure action - however there are a few exceptions. For example when we load a new trace we also need to send a blob, this can't be handled in a pure way (since we don't want to put a blob in the state as it can't be serialized) so this will have a dedicated method. - FrontendApi This object exposes the functionality of the main thread to the controller, again this will be a fairly limited interface: updateState() updateBigdata() etc. In order to use these two objects on another thread we create proxies (the pattern not the es6 Proxy) which wrap postMessage/onmessage and turn them into a Promise based API. The common code is extracted to remote.ts. Change-Id: I3a350bdd19cbbc8075c8b4cd4c015aaf3f07996e
Perfetto is an open-source project for performance instrumentation and tracing of Linux/Android/Chrome platforms and user-space apps.
It consists of:
A portable, high efficiency, user-space tracing library
designed for tracing of multi-process systems, based on zero-alloc zero-copy zero-syscall (on fast-paths) writing of protobufs over shared memory.
OS-wide Linux/Android probes for platform debugging
Web-based frontend
A UI for inspection and analysis of traces (coming soon).
Batch processing of traces
A python / C++ (TBD) library for trace-based metrics (coming soon).
Perfetto is building the next-gen unified tracing ecosystem for:
The goal is to create an open, portable and developer friendly tracing ecosystem for app and platform performance debugging.
Designed for production
Perfetto's tracing library and daemons are designed for use in production. Privilege isolation is a key design goal:
See docs/security-model.md for more details.
Long traces
Pefetto aims at supporting hours-long / O(100GB) traces, both in terms of recording backend and UI frontend.
Interoperability
Perfetto traces (output) and configuration (input) consists of protobuf messages, in order to allow interoperability with several languages.
See docs/trace-format.md for more details.
Composability
As Perfetto is designed both for OS-level tracing and app-level tracing, its design allows to compose several instances of the Perfetto tracing library, allowing to nest multiple layers of tracing and drive then with the same frontend. This allows powerful blending of app-specific and OS-wide trace events. See docs/multi-layer-tracing.md for more details.
Portability
The only dependencies of Perfetto's tracing libraries are C++11 and Protobuf lite (plus google-test, google-benchmark, libprotobuf-full for testing).
Extensibility
Perfetto allows third parties to defined their own protobufs for:
Allowing apps to define their own strongly-typed input and output schema. See docs/trace-format.md for more details.